I collect garbage three times to find finalized resources and free them. I don't know if this is always necessary or if 3 is the right number, but I learned to do it long ago and do it by habit.
Jay On Wed, Oct 2, 2013 at 11:28 AM, Vlad Kozin <vladilen.ko...@gmail.com>wrote: > Mostly a question to Jay McCarthy but I suppose could be interesting to > others. Was going over his Reversing > strings<http://jeapostrophe.github.io/2013-08-19-reverse-post.html> article. > Somehow I get weird performance. Slowest solution turns out fastest, > medium, fast and really fast are only marginally different. > > Could anyone have a look https://github.com/vkz/warm-up > reverse-string.rkt has the solutions > test-reverse-string.rkt does the performance check > Testing it on 40'000 randomly generated strings 1000 chars each. > > While we're at it, why do we garbage-collect thrice here? > let-values<http://docs.racket-lang.org/reference/let.html#%28form._%28%28quote._~23~25kernel%29._let-values%29%29> > ([(as cpu real gc) > (time-apply<http://docs.racket-lang.org/reference/time.html#%28def._%28%28quote._~23~25kernel%29._time-apply%29%29> > > (λ<http://docs.racket-lang.org/reference/lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~ce~bb%29%29> > () > exp<http://docs.racket-lang.org/reference/generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._exp%29%29> > ) > empty<http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28lib._racket%2Flist..rkt%29._empty%29%29> > )]) > (collect-garbage<http://docs.racket-lang.org/reference/garbagecollection.html#%28def._%28%28quote._~23~25kernel%29._collect-garbage%29%29> > ) > (collect-garbage<http://docs.racket-lang.org/reference/garbagecollection.html#%28def._%28%28quote._~23~25kernel%29._collect-garbage%29%29> > ) > (collect-garbage<http://docs.racket-lang.org/reference/garbagecollection.html#%28def._%28%28quote._~23~25kernel%29._collect-garbage%29%29> > ) > > Thanks! > --- > Vlad Kozin <vladilen.ko...@gmail.com> > > > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > > -- Jay McCarthy <j...@cs.byu.edu> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93
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